I've had the (lack of) luck to have several oil leaks/oil burning/smell issues.

-Split Blue OEM oil filter dripping oil that wind pushed onto the header.
-Leaking AVLS sensor on the drivers head replaced under warranty.
-Oil leaking from the crush washer.
-Dealer splashed oil on the outside of the engine after an oil change.
-And spark plug tube seals leaking oil that would fill the cabin with the hot oil smell towards the last half of my hour long commute.
-I had the headgasket issue as well but that didn't contribute to much smell.

I'd suggest getting under there with some simple green after your next oil change and clean everything so you can find it easily if it continues.